# Posts by SARA

Total # Posts: 4,477

**physics**

if 20g of steam at 100 c is mixed into 80 g of water at 20 c what is the final temperature if no heat lost

*April 27, 2014*

**Math**

What is the Schlafli Notation?

*April 27, 2014*

**Chemistry**

For the formation of ammonia, the equilibrium constant is known to be 5.2 × 10^−5 at 25◦C. After analysis, it is determined that [N2] =3M and [H2]=0.8M, both at equilibrium. How many grams of ammonia are in the 10L reaction vessel at equilibium? Use the ...

*April 27, 2014*

**Chemistry**

The compound M2X3 has a molar solubility of 0.0190 M. What is the value of Ksp for M2X3? Here are the choices: 1. 3.52 × 10^-6 2. 4.12 × 10^-5 3. 8.91 × 10^-8 4. 2.48 × 10^-9 5. 2.67 × 10^-7

*April 27, 2014*

**Chemistry**

So I disregard the temperature?

*April 27, 2014*

**Chemistry**

At 25C, an equilibrium mixture of gases con- tains 0.00680 mol/L PCl3, 0.0290 mol/L Cl2, and 0.00500 mol/L PCl5. PCl5(g) ⇀ ↽ PCl3(g) + Cl2(g) What is the equilibrium constant for the reaction? How would I do this? I'm so confused!

*April 27, 2014*

**grammar**

Does it have to be about a specific topic, or can we use any words? ex: Food for he letter F.

*April 27, 2014*

**Chemsitry**

If Kc = 6.38 × 105 for the reaction A(g) ⇀ ↽ 2B(g), what is Kc for the reaction written as 2B(g) ⇀ ↽ A(g)? How would I solve this?

*April 26, 2014*

**Chemistry**

NH4NO3(s) ¡æ N2O(g) + 2H2O(§¤). How much water is produced if 22.9 g of N2O is produced in this reaction? Answer in units of g I converted grams of N2O to mol. Then I did a mol ratio getting mol of H2O. Then I converted mol of H2O to grams. I got 18....

*April 26, 2014*

**Chemistry**

How many of the following changes would alter the numerical value of the equilibrium constant Kp for the reaction 2OF2(g) ⇀ ↽ O2(g) + 2F2(g)? I) an increase in temperature II) a decrease of the container volume III) adding more O2 at constant volume IV) adding a ...

*April 26, 2014*

**Manegerial accounting**

calculate the net operating income , evergreen corp has provided the following data: sales per period 1000 units ,selling price $ 40 per unit , variable manufacturing cost 12 per unit, selling expenses $5,100 pls 5% of selling price , administrative expenses $3,000 plus 20% of...

*April 24, 2014*

**3 physics question please help quick**

Two point charges of opposite sign are brought close together. Which statement best describes the field lines of the combined point charges? (Points : 1) The field lines from the positive charge point toward the negative charge. The field lines from the positive charge point ...

*April 21, 2014*

**HELP! 5th grade math**

Thank you!! how can i explain to her how to come up with the 2265? I get 2 L and 2L and she will only know that 2L converts to 2000ml how can she figure that leftover out? sorry this stuff totally confuses me :)

*April 13, 2014*

**HELP! 5th grade math**

Trying to help my child in 5th grade. Shannon pours 4 different liquid ingredients into a bowl The sum of the liquid ingredients is 8.53 liters. Two of her measurements are in milliliters and two of her measurements are in liters. Give an example of possible measurements for ...

*April 13, 2014*

**Math**

finding the slope of the line containing points with coordinate (-2,3) and (1,-3) by the definition

*April 11, 2014*

**5th Grade Math**

OMGosh Please help me (mom) so I can help my daughter with this word problem!!! Cam rode her bike 5 times as far as Dante did. Dante rode 187 meters farther than Michael did. Cam rode 15.25 kilometers. How many meters did Michael ride? Explain how you got your answer......

*April 10, 2014*

**chemistry**

If during an experiment, only potassium channels open on a neuron, what do you expect will happen to the membrane potential? Why?

*April 8, 2014*

**science -heredity**

there are about 100,000 genes in each cell. Why would it be important scientists to identify what every one of these genes does? I put Genes will describe a trait of a person, example, it will determine if a person will be small or tall; blue or brown eyes and brown or blond ...

*April 6, 2014*

**chemistry**

Based upon the intermolecular forces present, rank the following substances according to the expected boiling point for the substance: MgF2, H2O, HCl, N2

*April 3, 2014*

**Physics**

What capacitance in needed in series with an 785 µH inductor to form a circuit that radiates a wavelength of 199 m?

*March 28, 2014*

**econ**

The terms below are measures or individual components of the money supply. Specifically considering the money supply of the United States, rank these items from largest to smallest in terms of dollar value. Currency, M2,M1,Balances in savings accounts, travelers check

*March 27, 2014*

**econ**

economics- what is the law called where cost of input increases so cost of output must increase (in order to keep max profit)

*March 24, 2014*

**chemistry**

calculate the freezing point of an aqueous solution of 15.5 grams of glucose dissolved in 150 grams of water

*March 22, 2014*

**physics**

the frequency of wave A is 250 hertz and the wavelength is 30 cm. the frequency of wave B is 260 hertz and the wavelength is 25 cm. which is a faster wave?

*March 17, 2014*

**Chemistry**

Sorry. I just want to be sure that I am doing it right.

*March 11, 2014*

**Chemistry**

Determine the pH of a 1.2×10^−2 M solution

*March 11, 2014*

**Chemistry**

What is the pH of a solution whose [H3O+] is 9.2× 10^−9 M?

*March 11, 2014*

**Chemistry**

Do I use: pH= -log[h30+]

*March 11, 2014*

**Chemistry**

Thamks! How do I determine the pH value of this solution?

*March 11, 2014*

**Chemistry**

A solution contains 0.00245 M HCl. Determine the [H3O+] for the solution. points Determine the [OH-]

*March 11, 2014*

**Chemistry**

In neutralization reactions, acid + base ¨ salt + water HCl can be neutralized with NaOH. How many moles of NaOH will it take to neutralize 0.68 L of 0.29 M HCl? Is there a formula that I need to use here?

*March 11, 2014*

**Chemistry**

Thank You!! I got it right! My answer is 22.10853.

*March 11, 2014*

**Chemistry**

You have a vinegar solution you believe to be 0.8 M. You are going to titrate 21.39 mL of it with a NaOH solution that you know to be 0.774 M. At what volume of added NaOH solution would you expect to see an end point? Answer in units of mL

*March 11, 2014*

**Math**

What is the solution of: u-7+(-3)=-12

*March 11, 2014*

**Ashford PHI 208**

1. Tom Regan’s view of animals is that (Points : 1) They are important but not quite as important as human beings They have rights, which means that they should never be used for human purposes They may be ethically used because they were bred and raised for that purpose ...

*March 9, 2014*

**social studies**

This is nearly impossible but I made it try your best good luck

*March 6, 2014*

**econ**

In the country of Ambiguostan, the government is providing salt-mine concessions to USalt & Co, but due to recent elections, will be revoking these concessions in 9 years. Since the salt business will be booming for years to come, USalt & Co is a highly traded stock and will ...

*March 6, 2014*

**math**

leah has three fewer than 4 times as many dvds as Sonia has. Leah has 37 dvds. how many dvds does Sonia have?

*March 5, 2014*

**chemistry**

how are buckeyballs,diamond, and graphite similar? how are they different?

*March 5, 2014*

**calculus**

Find the correct values for the equation -x^3 +bx^2 +cx + d, using this information, local min x= -5, local max (1,11). Point of inflection = -2.

*March 5, 2014*

**Math**

How do I use gauss-jordan to solve this? Can you explain the steps and show what you multiplied, added, subtracted, etc to each row? 8x + 2y = -68 -7x - y = 55

*March 4, 2014*

**physics**

11) Three point charges of magnitudes +6.0 mC, -7.0 mC, and -13 mC are placed on the x-axis at x = 0 cm, x = 40 cm, and x = 120 cm, respectively. What is the force on the -13 mC charge due to the other two charges? A) -0.55 N B) -0.79 N C) 0.55 N D) 0.79 N

*March 4, 2014*

**accoutning**

What should I credit in this journal entry: If the owner of a company puts 50,000 of his own money into the company and gets 4,000 shares of stock. I know I need to debit cash but what do i credit? Thanks

*February 27, 2014*

**math**

Jason left home at 6:12 pm on march 25. He arrived back home 36 hours and 12 minutes later. What time did he arrive home?

*February 26, 2014*

**Math**

joe has a farm with 99 animal, four times as many cows as horses, twice as many horses as pigs. how many cows, horses and pigs are there?

*February 26, 2014*

**5th grade math**

thank you!!!

*February 25, 2014*

**5th grade math**

sue and dave shared 1/3 pound of cherries equally. What fractional part of a pound did each get? Molly wrote the following equation to solve the problem: (2 divided by 1/3) 2/1/3=n. Do you agree with Molly's equation? support your answer with information from the problem. ...

*February 25, 2014*

**math**

Where would you cut a board that measures 3 ft 1 1/2 in to divide it into two equal pieces?

*February 25, 2014*

**5th Grade Math**

Thank you so much, I had used something similar but with Pizza but apparently cake was more appealing when I explained it to her, so Thank you. Okay Now there is one that i can't even think of.........Write a Word Problem for..... 4/5 x 1/4 + 3/5 = 4/5 Sheesh! Any ...

*February 24, 2014*

**5th Grade Math**

I didn't see how to turn that problem into a word problem on that page. Doesn't mean it's not there, I just didn't see it. She knows how to multiply the problem, it's coming up with a word problem that she can't see out of it. :)

*February 24, 2014*

**5th Grade Math**

3/4 x 1/2 = 3/8 Need to write a word problem for this equation, and then my daughter has to draw a model to show the product. She doesn't believe that the equation I gave her is useable so I am turning to here. Thank you!

*February 24, 2014*

**chemistry**

In the net ionic equation for the neutraliza- tion reaction between hydroﬂuoric acid (HF) and sodium hydroxide (NaOH), the HF is rep- resented as 1. the molecule, HF. 2. neither the molecule nor the separated ions since it is a spectator in the reaction. 3. the ...

*February 23, 2014*

**Chemistry**

Which of the following substances would be expected to be the strongest electrolyte (best conductor of electricity) in solution with H2O as the solvent? 1. HF 2. BaF2 3. PCl3 4. CH3OH

*February 23, 2014*

**math**

20%is less than 32

*February 23, 2014*

**chem**

The bond length of RbF is 284.00 pm. What would be the dipole moment, in D, of this compound by assuming a completely ionic bond? Remember e = 1.60x10-19 C; 1 D = 3.34x10-30 C*m

*February 23, 2014*

**chem**

Radioactive substances decay by first-order kinetics. How many years would be required for a sample containing strontium-90 to decrease to 58.32% of its initial activity? The half-life of strontium-90 is 2.88e1 years.

*February 22, 2014*

**college chemistry**

awesome thanks!

*February 22, 2014*

**math**

given THE DERIVATIVE 8X^3+ 9X^2 -2X +5. find the original equation using (2,3)

*February 18, 2014*

**math**

The equation of a line is X+Y=1 and the equation of the function is y= 2/x +k. Solve for k and find the points on the tangent line

*February 18, 2014*

**sociol student**

A woman wantes to drive 83 km in 2 h. If she average 42 km/h for the first 1.27 h, what average velocity must she maintain for the remaining time in km/h?

*February 18, 2014*

**speech**

I have to do an explanatory speech. i have to choose a discovery or innovation that people know the general idea about but don't know anything beyond that. does anyone have any ideas? Just as an example of the type of speech im looking for you could do : Counterfeit money(...

*February 17, 2014*

**Personal Dimensions of Education**

IS

*February 16, 2014*

**math**

This is just too SIMPLE!!1

*February 13, 2014*

**Math**

Half of a pizza was split evenly among 5 adults, two of whom split their share of the pizza into thirds with their children. What fraction of the pizza did the pizza did each of the children get?

*February 12, 2014*

**Math**

Ruth is making a quilt and needs 7/8 of a yard of fabric for each of the 5 fabrics in the quilt. How much total fabric does she need? Express your answer as a mixed number.

*February 12, 2014*

**Math**

Nathan has 3.5 bags of marbles in his room. The rest of the marbles are in his car. If he owns 6 bags of marbles, how many bags are in the car?

*February 12, 2014*

**MATH CHECK ANSWERS**

Good Job!

*February 11, 2014*

**Science**

Amanda is 100% right

*February 8, 2014*

**Math**

Solve for y Xy+ p=5

*February 6, 2014*

**math**

How to do data, picture, equation and result for a problem

*February 3, 2014*

**Calculus & Vectors**

A search and rescue aircraft, travelling at a speed of 240 km/h starts out at a heading of N 20 degrees West. After travelling for 1h and 15 min, it turns to a heading of N 80 degrees E and continues for another two hours before returning to base. Find the total distance the ...

*February 1, 2014*

**physics**

A barge is hauled along a straight-line section of canal by two horses harnessed to tow ropes and walking along the tow paths on either side of the canal. Each horse pulls with a force of 450 N at an angle of 15° with the centerline of the canal. What is the net force on ...

*January 28, 2014*

**college physics**

Suppose a 200-kg motorcycle is heading toward a hill at a speed of 30.0 m/s. The two wheels are approximately annular rings with an inner radius of 28.0 cm and an outer radius of 33.0 cm. The mass of one wheel is 12 kg.What is the initial rotational kinetic energy

*January 28, 2014*

**physics**

Does an solid expand or contract as the temperature rises?

*January 28, 2014*

**physics**

1. Where does sound travel fastest? water, salt water, steel, or wood 2. Does sound travel faster in salt water than water?

*January 28, 2014*

**Calculus HELP!!**

The 6 2 1 is supposed to be on the right hand side of the equal sign. I am so sorry again!!!

*January 27, 2014*

**Calculus HELP!!**

Then after this, use that fact to find x1 and x2 that satisfies the equation: 6 2 6 4 2 2 5 3 {x1 and x2} = 1

*January 27, 2014*

**Calculus HELP!!**

u=6 4 5 v=2 2 3 w=6 2 1 show that 2u - 3v - w = 0 Sorry!! I hope this makes a bit more sense...Can we try to do this step by step so I can understand it better?

*January 27, 2014*

**Calculus HELP!!**

6 2 6 Let u = 4 , v = 2 , w = 2 5 3 1 Show that 2u - 3v - w = 0. Use that fact to find x1 and x2 that satisfy the equation 6 2 6 4 2 {x1} = 2 5 3 {x2} 1

*January 27, 2014*

**Science**

Melaine is tired all the time. No matter how much rest she gets and food she takes in she doesn't have energy. What is the organelle that is malfunctioning in her cells? Justify your answer.

*January 25, 2014*

**physics**

Water drips from a faucet into a flask at the rate of two drops every 3 seconds. A cubic centimeter contains 20 drops. What volume of water, in cubic decimeters will be collected in 1 hour?

*January 23, 2014*

**math help**

Round to nearest ten thousandth: 4.803621

*January 22, 2014*

**math help**

Round to nearest ten thousandth: 4.803621

*January 22, 2014*

**Science - 7th grade**

Is radiation damaging to the health of humans? If so, in what way/ways? My answer is: Yes, radiation though helpful in treating certain diseases is damaging to the health of human beings in many ways one of which being that it mutates our DNA and is unhealthy. It can also make...

*January 16, 2014*

**Ap world**

What caused feudalism to develop in japan? Europe? Can you please give the cause separately for each because I keep finding answers of them together. Thank you

*January 12, 2014*

**Social studies (History)**

Yes, those are great... Thank you...

*January 9, 2014*

**Math Question**

Hi, I need help with a math question. Thank you to whoever helps me! :) When solving a system of 2 equations and 2 unknowns using the substitution method, what is the ideal value of the coefficient of the isolated variable?

*January 7, 2014*

**Elementary Math**

I had her do an exact 15.4 x .7 and came up with 10.78. Just wanted to show her that this was the correct way of doing this problem. She didn't believe me :) Thanks for your help and confirmation

*January 2, 2014*

**Elementary Math**

This is going to seem like a simple question but how do i solve this without dividing.. 5th grade math mom Question: Lester's car can go 15.4 miles on 1 gallon of gas. How far can he go on 0.7 gallons? Thanks

*January 2, 2014*

**algebra**

Identifying Zeros and Their Multiplicities f(x) = 5(x - 2)(x + 3)²(x - 1/2)4

*January 2, 2014*

**chemistry**

Nitroglycerin, C3H5N3O9, is a shock sensitive liquid (density = 1.450 g/mL) that detonates by the reaction 4 C3H5N3O9(l) ® 10H2O(g) + O2(g) + 6N2(g) + 12CO2(g) How many grams of N2 will be produced during the detonation of 2.813 L of nitroglycerin?

*December 15, 2013*

**Algebra 2**

-1,2,5

*December 8, 2013*

**Spanish 2 Help!**

Fill in the blamks with the appropriate pronoun and conjugated reflexive verb. 1.)Tu_____ ______ el pelo (peinarse) Bank 1= Blank 2= 2.)Raul y Sarita no___ ___ afeitarse) Blank 1= Blank 2= 3.)No prefiero_____el pelo.(lavarse) Blank 1= 4.)Elena____ ____a las 10:00(acostarse) ...

*December 8, 2013*

**stats**

in a sample of 159,949 first year college students, the national survey of student engagement reported that 39% participated in community service or volunteer work.find the margin of error for 99% confidence. ...idk what formula to use.

*December 5, 2013*

**College algebra**

Solve the system Y=3x-2 6x-2y=30

*December 3, 2013*

**College algebra**

Solve the system X=2y+3 3x+4y=59

*December 3, 2013*

**calc**

thanks. so how would u see if f is undefined? how do you get f from f'?

*December 3, 2013*

**calc**

The derivative of a function f is f'(x) = x^2 - 8/x: Then at x = 2, f has A. an infection point B. a relative maximum C. a vertical tangent D. a discontinuity E. a relative minimum how do you test for all of these?

*December 3, 2013*

**calculus**

thanks! i forgot to add the 4 to the .5xy

*December 3, 2013*

**calculus**

A display case is in the shape of a rectangular box with a square base. Suppose the volume is 21 cubic ft and it costs $1 per square ft. to build the glass top and $0.50 per sq. ft. to build the sides and base. If x is the length of one side of the base, what value should x ...

*December 3, 2013*